Apparatus for forming cement tanks.



No. 787,157. PATENTED APR. ll, 1905. J. T. DONAHOO.

APPARATUS FOR PORMING CEMENT TANKS.

APPLICATION FILED SEPT. 12, 1904.

2 SHEETS-SHEET 1 ATTORNEYS No. 787,157. PATBNTED APR.'11, 1905. J. T. DONAHOO.

APPARATUS POR PORMING CEMENT TANKS.

APPLICATION FILED SEPT. 12, 1904.

2 SHBETS*SHEBT 2.

ATTORNEYS Patented April 11, 1905.

,l A .\l ES TBB DONAll O O` OF EDG Al, NEBRASKA.

APPARATUS FOR FORWHNG CEMENT TANKS.

PECIFXCATION forming part of Letters Patent No. 787,157', dated April 11, 1905.

Application tiled September l2, 1904. Serial No. 224,157.

latcnt No. Titian). 'l`heapparatus is particularly adapted t'or t'orming cement tanks ot large dimensionsl or having a high vertical wall.

'lhe details ot' construction. arrangement,

and operation ot parts ai'e as hereinafter descrihcd. ret'erence heing' had to the accompa nying drawings, in whichv Figure l is a perspective view illustrating the main features otI the apparat-us, portions heing hrokeu away to show the interior construction and arrangement otl parts. Fig. 2 is a cross-section ot' the hase portion ot' the apparatus omitting the outer lixed forni or wall and also the shaper t'or the bottom of the tank.

portion or hase ot the rotating mast. Fig. t is a perspective view illusti'ating' the means t'or pressingtogether the planks otl the inner cylindrical t'orm. Fig. 5 is a cross-section on line 5 ot' Fig. l.

'l`he cistern or tank to he produced is cii'cular in l'orni. For producingl the same l employ au outei' cylinder which is tixed in position and constitutes tlieoutei' forni, while an iniici' revolving cylinder B constitutes the i inner t'orin. hetween which pai'ts the vertical wall ot' the completed tank or cistern is pi'oduced, the two t'orms A l heingspaced apart the distance correspoiiding to the required thickness ot the side or wall ot the tank. ln connection with the inner revolving cylinder t'orm B, l employ special means connected with a vertical concentricmast or post C for supy tends laterally, so as to he adapted lor use in porting and carrying said forni, and l also employ in connection with said mast a t'orm and revolving shaper l), which forms the hottom ot the tank.

l will now proceed to describe the details Fig. 2% is a vertiealsection illustrating the connection ot certain parts with the lower l otl construction and arrangement ot parts. The vertical revolving mast or post() is stepped in a hase-plate l and provided at the top with a tenoii L), which is cylindrical in torni and adapted to rotate within an ii'on cap 3. This cap is connected hy guys l@ with stakes 6, driven in the ground at a suitahle distance around the l'iXed cyliiidei' A. lt will he understood that the cylinder A is lirst set in position coiiceiiti'ic with the mast or post C and that the same may he conveniently constructed ot' steel sections held in place hy means ot' hands T, as shown. rl`he inner cylindrical lorm B is siiiiilai'ly constructed ot' vertical steel sections` the same resting and heing supported upon a series of connectcd segmental plates S, arranged with their arc sides outwai'd` so as to t'orm a circle corresponding to the dianieterot' the t'orm B. As shown in Fig. l, the Yt'orni B rests in a rahhet or shoulder formed on the outer edge ot' the segments S. 'l`he latter are connected hy metal plates which ai'e secured by screws or nails. Their ends are also attached to radial steel hars 10, whose inner ends enter a circumferential groove in a collai' 11, which is lixed on the mast 6 and revolves therewith. Thearrangement is Further illustrated in Fig. 3. For supporting the parts 8 l employ guys l2, which are provided with turnhiickles` as shown` tor the purpose ol adjusting their length as conditions require. The upper ends ot' these guys are secured to a collar 13, applied to the upper portion ot' the mast C and held indue position thereon hy means ot' crossholts ll, (see Fig. 5,) and their lower ends are attached to the eyes ol: screw-bolts l5, insorted in the segments S. lloops 16 are applied to the upper and lower portions o't` the inner t'oriii B, and the upper portion of the same is hraced interiorly hy means ol con-y nected segments o and radial plates or hars l0", whose inner ends enter and are adapted to slide around in a grooved collar 11. lever 1T is secured tothe top oi the mast C and exrotating the mast and therewith the inner form B. lt is prelei'i'ed that the operator shall travel upon a raised sca tlold. (Illustrated hy dotted lines, Fig. l.)

So i

lt is obvious that IOO two or more levers may be employed, as con- I ditions require. As before stated, the two forms A and B are separated a distance equal to the thickness the completed tank is required to have.

For shaping the bottom portion of the tank I employ a bar D, which preferably consists of an iron tube having its outer end upturned to form the corner of the tank. This shaper D lis secured to the bottom of the mast by means of a clamp consisting of clevises 18 and a cross-bar 19, as shown in Figs. 1 and 3. rlhe upturned end of the shaper D abuts the under side ot' one of the segments 8, and its outer side is of course in alinement with the corresponding side of the inner form B.

It will now be understood that by applying due pressure upon the lever 17 the mast C will be rotated, and that the cylindrical former B, with all its attachments 8, 10, 8, 10, and 12, will be carried around or revolved, also that the shaper D will have a similar movement and sweep around over the surface upon which the cement is deposited. Such deposit is made in the first instance through the space between the upper braces 10u and the lower braces 10, and the shaper D passing' over the cement smoothes it down 'and spreads it out until it attains the required thickness and has asmooth surface. In other words, the bottom of the tank reaches the dotted line indicated in Fig. 1. The cement for forming the side wall is of course deposited in the space between the two cylindrical forms A and B, the inner form being left stationary while this portion of the work is being completed.` The cement may be tamped while being deposited in order to insure homogeneity of structure. The cement wall will be carried nearly to the top of the forms A B, as indicated by dotted line, Fig. 1.

When the cement has set, the apparatus is removed, leaving the cistern or tank standing'.

It is required that the steel sections composing the inner cylinder or form B shall fit tightly together, so that the Jform as a whole shall have due rigidity, and for this purpose I employ means illustrated in Figs. 1 and 4. The same consists of a plate 20, which is essentially right angular, and devices formed of rightandleft screws and a right-and-left nut 21, with which they are connected. One member of the plate 20 is set against the edge of a section 22, as shown, and the other overlaps the opposite one, 23, so as to cover the space that intervenes them, while the adjusting devices 21 are arranged between the section 23 and the radial member of the angular plate 20. It is now apparent that by rotating the nut 21 pressure may be applied to the opposing sections 22 23, and thus to all the sections composing the form B, so that they will be held in close and firm contact.

table form whereby the two are operated together, substantially as described.

2. The improved apparatus comprising an outer fixed cylindrical form, an inner revolving concentric form spaced therefrom and means for supporting and carrying said inner form which consist of a central rotatable mast, a series of radial braces extending from said mast, segments connecting the outer ends of the same and devices connected with the mast and serving as vertical supports substantially as described.

3. rI`he improved apparatus comprising an outer fixed cylindrical form, an inner and concentric form which is spaced therefrom, a central rotatable mast, segments upon which the inner form is supported and carried and guys extending from such segments to the mast and serving' as vertical supports substantially as described.

4. The improved apparatus comprising two cylindrical concentric forms which are spaced apart, the inner one being adapted to revolve, and concentric rotatable-mast segments and radial braces connected and arranged for supporting and bracing the inner form at its base, a corresponding series of segments and radial braces arranged near the top ot' the inner form, grooved collars on the rotatable mast which receive the inner ends of the radial braces, and means for supporting the inner form as a whole from the said mast substantially as described.

5. The improved apparatus comprising a central vertical mast, a concentric cylindrical form and means for supporting it and carrying it with the mast when rotated, and a support secured to and revolving with the mast, the same extending radially from the. latter and having its outer end arranged in working relation with the base of the said form, substantially as described.

6. In an apparatus for forming cement tanks the inner revoluble part comprising a cylindrical form, a concentric rotatable mast, means for bracing the said form radially from said mast and devices connected with the base portion or' the form and the upper portion-of the mast and a shaper attached to the mast substantially as described.

JAMES TABB DONAHOO.

Witnesses:

GEO. GODFREY, MAYNARD W. KoUNs.

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